Azo dye and process of making same.



KARL SOHIRMAOHER, OF HOCHST-ON-THE-MAIN, GERMANY, ASSIGNOR TOFARBWER-KE, VORM. MEISTER,

LUOIUS & BRUNING. OFHOCHST- ON-THE-MAIN, GERMANY, A CORPORATION OFGERMANY.

AZO DYE AND PROCESS OF MAKING SAME.

Specification of Letters Patent.

Patented Nov. 27, 1906.

Application filed June 1, 1906. Serial No. 319,665.

To all whom it may concern:

Be it known that I, KARL SOHIRMACHER, Ph. D., chemist, a citizen of theEmpire of Germany, residing at Hochston-the-l\'Iain, Germany, haveinvented certain new and useful Improvements in the Process of'Making anAzo Dyestuff Suitable for the Preparation of Lakes, of which thefollowing is a specification.

By combining diazotized ar thranilic acid with 2.6-naphtholsulfonic acidan azo dyestuff may be obtained which is valuable for the preparation oflakes. The lakes obtained in the usual manner with this dyestuff exhibitbeautiful red tints and are distinguished by their fastness to light.

The dyestuff is obtained, for instance, as follows: 13.7 kilos ofanthranilic acid are'diazotized in the usual manner with twentyfivekilos of hydrochloric acid of Baum s ecific avity and 6.9 kilos ofnitrite. This d iazo so ution is introduced into a solution oftwenty-five kilos of the sodium salt of 2.6- naphtholsulfonic acid andtwenty kilos of sodium carbonate. The formation of the dyestuff is sooncomplete. When dry, the d estufi is a red powder of bronze lusterissolved by water to a yellowred solution. The

solution in concentrated sulfuric acid is yellow-red. The lakes obtainedfrom this dyestuff in the usual manner are of a bright-red color andexceedingly fast to ligh Having now described my invention, What I claimis- 1. The p manufacture of a red monoazo dyestuif specially suited forthe reparation of lakes, which consists in com imn diazotizedanthranilic acid with 2.6-napht olsulfonic acid.

2. As a new product, the monoazo dyestuff obtained by combinindiazotized anthranilic acid with 2.6-naphiolsulfonic acid, being whendry, a red powder of bronze luster, soluble in water with a yellow-redcolor; the solution in concentrated sulfuric acid being yellow-red; thelakes obtained from this dyestufi are of a bright red and distinguishedby their great fastness to light.

In testimony that I claim the foregoing as my invention 1 have signed myname in presence of two subscribing witnesses.

KARL SCHIRMACHER.

Witnesses:

JEAN GRUND, I CARL GRUND.

recess herein described for the

